i6o 



PRACTICAL ANATOMY. 



centre of the dense ligaincnta vagitialcs and you will come down on the two 

 flexor tendons. Notice that the tendon of the flexor profnndus digitontui passes 

 through a slit in the tendon of the flexor snbliinis digitornin. (Fig. 1 10.) The 

 former is inserted into the base of the third, the latter into the base and sides of 

 the second phalanx. Now gently separate these tendons and you will see (i) 

 the visceral layer of synovial membrane on the tendons, and (2) the vincula 

 delicate tendinous cords. 



Flexor carpi 

 ulnaria 



Abductor minimi 

 digiti 



Flexor sublimis 

 digitorum 



Flexor brevis 

 minimi digiti 



Flexor prot'undus 

 digitorum 



Extensor oasis metacarpi pollicis 

 Flexor carpi radialis 

 Extensor brevis pollicis 



Abductor pollicis 



Opponens pollicis 



Abductor 

 pollicis 

 Flexor brevis 

 pollicis 





FIG. 112. THE DEEPER MUSCLES OK THE PALM OK THE HAND. 



These heavy, deep fascial sheaths you have just cut through are lined by 

 synovial vaginal membrane called the theca. In the thumb and little finger these 

 synovial cavities communicate with the ulnar and radial palmar bursae above the 

 annular ligament. (Fig. 107.) 



The thecre for the remaining fingers terminate in thecal culs-de-sac opposite 

 the metacarpo-phalangeal articulations. (Fig. 107.) 



Infection in the thumb and little finger thus is liable to travel beyond the 

 annular ligament, while in the other fingers it would be arrested at the culs-de-sac. 



